| // Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| package com.android.tools.r8.ir.code; |
| |
| import com.android.tools.r8.cf.LoadStoreHelper; |
| import com.android.tools.r8.cf.code.CfStackInstruction; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.ir.conversion.CfBuilder; |
| import com.android.tools.r8.ir.conversion.DexBuilder; |
| import com.android.tools.r8.ir.optimize.Inliner.ConstraintWithTarget; |
| import com.android.tools.r8.ir.optimize.InliningConstraints; |
| |
| public class Pop extends Instruction { |
| |
| public Pop(StackValue src) { |
| super(null, src); |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.POP; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| @Override |
| protected void addInValue(Value value) { |
| if (value.hasUsersInfo()) { |
| super.addInValue(value); |
| } else { |
| // Overriding IR addInValue since userinfo is cleared. |
| inValues.add(value); |
| } |
| } |
| |
| @Override |
| public boolean isPop() { |
| return true; |
| } |
| |
| @Override |
| public Pop asPop() { |
| return this; |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| return other.isPop(); |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, DexType invocationContext) { |
| return inliningConstraints.forPop(); |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| throw new Unreachable("This classfile-specific IR should not be inserted in the Dex backend."); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| builder.add(CfStackInstruction.popType(inValues.get(0).outType())); |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| throw new Unreachable("This IR must not be inserted before load and store insertion."); |
| } |
| |
| @Override |
| public boolean hasInvariantOutType() { |
| return true; |
| } |
| |
| @Override |
| public boolean canBeDeadCode(AppView<?> appView, IRCode code) { |
| // Pop cannot be dead code as it modifies the stack height. |
| return false; |
| } |
| |
| @Override |
| public boolean instructionMayTriggerMethodInvocation(AppView<?> appView, DexType context) { |
| return false; |
| } |
| } |